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LAUNCH X431 V+(PRO3) HD: Cutout Cylinder Test on Foton Pilot

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  The LAUNCH X431 truck diagnostic tool performs the cutout cylinder function on a 2019 Foton Pilot truck. Background information on the function: When an engine experiences problems such as unstable idling, insufficient power, vibration, black smoke, or abnormal noise, it is impossible to directly determine which cylinder is malfunctioning based on visual inspection. The Cutout Cylinder Test can effectively narrow down the scope of the fault and determine which specific cylinder is malfunctioning. Cutout Cylinder Test : When the fuel supply (diesel engine) or ignition (gasoline engine) is cut off, the engine will show significant changes such as reduced speed and increased vibration due to a noticeable drop in power. This is normal. If the engine’s operation remains almost unchanged after cutting off a particular cylinder, it indicates that the cylinder itself is either not working or is working very poorly, and is the source of the fault. For modern electroni...
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LAUNCH X431 ECU Programmer vs. XPROG3 PC Adaptor

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 The LAUNCH XPROG3 with PC Adaptor can perform operations such as cloning vehicle ECUs. This is similar to the X431 ECU & TCU Programmer . So what are the differences between the two? This article will answer that question. Answer: The LAUNCH X431 ECU & TCU Programmer supports reading and writing vehicle ECUs, verification, and IMMO OFF functionality. It has its own PC software and is a fairly comprehensive ECU programming tool. However, it cannot be used with the X431 diagnostic tool, nor can it perform key programming tasks. The LAUNCH XPROG3 , when used with the X431 diagnostic tool, can perform key programming on various vehicles, as well as engine and transmission replacement. When the XPROG3 is used with the PC Adaptor , ECU programming software can be used for ECU cloning and programming. Furthermore, the XPROG3 + PC Adaptor has the same functionality as the LAUNCH X431 ECU & TCU Programmer. Both companies have the same policy and pricing for ...
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LAUNCH X431 PRO3 vs PRO vs Elite vs CRP919X: 2026 Buyer's Guide

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 In 2026, the diagnostic tool market has shifted — it is no longer about who has the most features, but who offers the most functional value per Euro. For workshop owners, selecting the right equipment is a critical investment decision. In this guide, we analyze the four standout performers of the year — the LAUNCH X431 PRO3 , X431 PRO(V5.0) , X431 PRO Elite , and CRP919X BT — to help you identify the best ROI for your specific business needs. 2026 Value Comparison Matrix Quick-Reference Value Comparison Legend: ● = Supported | ◎ = Expandable | — = Not Supported The Powerhouse: LAUNCH X-431 PRO3 (V+ 5.0) Price: €723 | Best For: Workshops requiring advanced visualization and heavy-duty scalability. The PRO3 remains the flagship of the "Value" category. While it is the most expensive on this list, its value lies in diagnostic speed and visual clarity. Intelligent Topology Mapping: Unlike lower-tier models, the PRO3 offers a visual representation of the v...
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LAUNCH X431 ECU Tool Clone Kia Bosch MEG17.9.12 ECU Guide

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 This article will introduce how to clone a Kia Bosch MEG17.9.12 ECU using the LAUNCH X431 ECU tool ( XPROG3 + PC Adaptor / X431 ECU & TCU Programmer ). The demonstration uses LAUNCH XPROG3 + PC Adaptor ; the same operation can be performed using X431 ECU & TCU Programmer. 1) Open the XPROG3 PC Adaptor software and search for "MEG17.9.12" in the search bar. Click on the corresponding ECU in the search results and select BENCH mode. 2) Click [Direct connection of diagram] and connect the ECU according to the wiring diagram. 3) After connection, click [Read ECU information] -> [Read complete data] in sequence. Save the read file, and then click [Disconnect] . 4) Replace the ECU that needs to be replaced and rewire it. After rewiring, click [Read ECU information] , then click [Write complete data] to write the original data back to the ECU. 5) After the software prompts "Data is successfully written," click [Disconnect] . The ECU clon...
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LAUNCH X431 PAD V ELITE: MAN TGM Truck PDF Value Reset

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 This article will describe how to use the LAUNCH X431 PAD V ELITE to perform the PDF parameter reset function (on a 2013 MAN TGM truck after replacing the PDF). Background description : The DPF (Diesel Particulate Filter) in a diesel engine is responsible for capturing carbon particulate matter in the exhaust and preventing it from being released into the atmosphere. Over time, the DPF can become clogged. Normally, performing DPF regeneration can clear the clogged particles, but if the blockage is severe, cleaning or replacement may be necessary. Even after replacing the DPF, the old carbon load data (i.e., the total amount of particulate matter accumulated in the DPF) stored in the vehicle’s ECU (Electronic Control Unit) still exists. If it is not reset, the ECU will mistakenly believe that the new filter is severely clogged, thus continuously triggering regeneration commands, limiting torque and speed, and even illuminating the malfunction indicator lamp, affectin...
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LAUNCH X431 Truck Diagnostic Software Update in January 2026

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 LAUNCH X431 Heavy Duty Diagnostic Software Update (January 23, 2026). This update patch applies to the X431 PRO3 series and X431 PAD series with LAUNCH X431 truck diagnostics activated. The following is the upgrade log for this update patch. SCANIA V16.16 New add thirty special functions. New add MCC3,TMS3,SC3 Data stream. Optimize Wabco ELC Generation 1 and Wabco ELC Generation 2 function. HD_TATA V10.71 Synchronized update for TATA models, addressing issues in EMS, Electronic Diesel Control, Common Rail, and Immobilizer systems. HD_FUSO V18.10 Added functions for systems including EEC- Engine Electronic Control Unit and EBSElectronic Braking System under the SuperGreat 21M(6R), SuperGreat 21M(6S), and SuperGreat 17MODEL vehicle models; Added actuation test functions for the IMMO — Immobilizer Control Unit system under the Aero Star 19MODEL vehicle model; Optimized software structure. HD_DFAC V11.45 New engine and exhaust gas post-treatment systems were ...
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LAUNCH X431 Pro3S+ Elite: Fix Toyota Sienna Crank No Start

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 Dealing with a frustrating crank, no-start? This real-world case study on a 2015 Toyota Sienna shows how a LAUNCH X431 PRO3S+ Elite scanner can cut through the guesswork. See how it provided the critical data to quickly redirect the diagnosis toward a failing fuel pump, saving precious diagnostic time. Vehicle: 2015 Toyota Sienna Complaint: Engine cranks but will not start. Intermittent stalling history. Diagnostic Goal: Identify the root cause of the no-start condition. Key Diagnostic Tool Used Initially: X431 PRO3S+ Elite Step-by-Step Diagnostic Procedure: Initial Scan & Critical Data Verification Tool Used: LAUNCH X431 PRO3S+ Elite . Action: Perform a full vehicle scan. Finding: ECM code: "Start Ability Malfunction." This confirms the no-start condition is electronic. Action: Use the Live Data Stream function. Finding: Monitor "Engine Speed" while cranking. The RPM signal is present. Conclusion: The crankshaft position sensor is workin...
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